'''
class Foo:
    name = 'letian '
    @classmethod
    def hi(cls, x):
        print(cls.name * x)
    @staticmethod
    def xi(a,b):
        return a+b
foo1 = Foo()
foo1.hi(2)
print(foo1.xi(3,5))
'''
'''
class A():
    i = 10
    def B(self,j):
        slef.j = j
print(A.f)
'''
'''
with open ("sdfr.txt",'w',encoding="utf-8") as f:
    lines = f.readlines()

dic = {'name':'张三'}
print(dic['named'])

print i

a = int(input())
'''
print(2/0)